Generate a full detail guide on navigating change and uncertainty. The guide's tone should be grounding and supportive. It must include sections on: 1. Why Uncertainty is So Stressful for the Brain. 2. Grounding Techniques to Use When Feeling Overwhelmed. 3. The Importance of Focusing on What You Can Control. 4. How to Maintain a Sense of Routine During Unstable Times. Please include a supportive disclaimer.